I recently ran into the error below when I tried to access a Wiki Page after I migrated over a SharePoint 2010 Enterprise Wiki Site from one location to another.
This page is not using a valid page layout. To correct the problem edit page settings and select a valid page layout.
This sometimes happens after a migration of SharePoint Publishing Site Pages because the page layout URL is “hardcoded” into the aspx pages, and if you migrated from one location to another the possiblity of that page layout not exiting or is incorrectly listed in your page will throw this error. SharePoint is not smart enough to update this.
If you were to download a copy of that page and open it up you would see that the URL for the PublishingPageLayout is “hardcoded” with the “old” or “non existing” page layout. Look for the <tag>:
<mso:PublishingPageLayout msdt:dt=”string”>URL to Publishing Page Layout</mso:PublishingPageLayout>
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